docs: def build(ctx, inputs, output, cs):
      """Build chemical name dictionary."""
      click.echo('chemdataextractor.dict.build')
      dt = DictionaryTagger(lexicon=ChemLexicon(), case_sensitive=cs)
      names = []
      for input in inputs:
          for line in input:
              tokens = line.split()
              names.append(tokens)
      dt.build(words=names)
      dt.save(output)